Loud-speaking telephone



June 1 1926.

S. M. FRANSES LOUD SPEAKING TELEPHONH Filed Jan. 23, 1923 Jar/engor- 8, 31 Trainee Patented June 1, 1 926.

UNITED STATES smear. moisn emails, or rams, Imam.

LOUD-SPEAKING TELEPHONE.

Application filed January 23, 1923, Serial 1110. 614,497, and in France November 21, 1922.

5 phone, reed telephone, or vibrating diaphragm telephone. electro-dynamic telephone, etc..), and of a sound box preferably made of wood and particularly dry that forms the body of string instruments. The telephone receiver and the sound box are arranged in any manner whatever in relation to one another, but so that the mechanical vibrations of the movable part of the telephone receiver are transmitted. directly or indirectly, to a vibrating wall or side of the sound box mentioned above.

The invention will be fully understood with the assistance of the accompanying drawings Fig. 1 represents in elevation and in section and Fig. 2 in plan a means of carrying out the invention, shown diagramn'iatically. The sound box consists of a wooden box in which the vertical panels A are sufficiently thick and the panels or ends B and C are veneered on both sides, pine etc, of suitable thickness so as to vibrate suitably. In the upper panels B two holes D are formed acting in the same manner as the sound holes of a violin. Two wooden cores E encased between the two walls B and'C assure them a certain tension and transmit the vibrations of B to C. The whole box rests on four legs F so that the part r is not in contact with the ground or with the furniture on which the box is placed. On the upper part of the sound box rectangular pieces are fixed between which the rod 1 that supports the telephone receiver J with vibrating diaphragm is attached to the shaft H. The telephone receiver rests by gravity on the part- B of the sound box through the medium of a metal rod K firmly connected with the vibrating diaphragm. The wires L and M transmit the current to the receiver. When the latter comes into action the rod K transmits its vibrations to the part B and comes in turn into action and causes C to vibrate. The body of air contained in the box and the surrounding air are shaken and the modulations recorded by the telephonic receiver are suitably amplified. The stud N shown above the receiver serves for suitably regu'- lating the air vent of the receiver.

A telephone receiver without provision for regulating of air gap may be employed if a method of mounting as shown in dotted lines be adopted. The support 1 is extended at 1 and has running through it a shaft 0 fixed on the box and screw-threaded at its end, a milled stud P makes itpossible by exercising a suitable pressure on 1 to act through the medium of K on the vibrating diaphragm of the receiver and to regulate-the phone may consist of the body of a violin or some other known musical instrument, the telephone employed acting on it and being arranged in relation to it as stated above.

Claims I 1. A loud speaking telephone, comprising a sound box having comparatively thick vertical end panels and thin upper and lower Walls capable of vibrating, a telephone receiver, and adjustable means for supporting said receiver relative to and in contact with one of said thin walls to impart the vibration of the receiver to such wall.

2. A sound box made up of comparatively rigid side walls and upper and lower vibrating walls rigidly connected to the side walls and inclosing a sounding space, a.

rigid element connecting the vibrating walls, a member rising from one of the rigid walls, a rod connected to the member, and a telephone receiver carried by the rod, said receiver having contact with one of the vibrating walls.

3. A sound box made up of comparatively rigid side walls and upper and lower vibrating walls rigidly connected to the side Walls and inclosing a sounding space, a rigid element connecting the vibrating walls, a member rising from one of the rigid walls, a rod connected to the member, a telephone receiver carriedby the rod, said receiver having contact with one of the vibrating walls, and means for adjusting said contact.

In witness whereof I aflix my signature.

SAMUEL MOTSE FRANSES. 

